During 2015, TG2 has published more than 20 research papers. Some of the results are highlighted as follows:

(a) Dark Energy:

Consistency demands that the standard model of the Universe is complemented by an early phase of rapid expansion dubbed inflation and late time cosmic acceleration. By introducing potentials steeper than the standard exponential, we construct models that can give rise to a successful inflationary phase, with signatures consistent with Planck 2015 results. Additionally, using nonminimal coupling of the scalar field with massive neutrino matter, we obtain the standard thermal history of the Universe, with late-time cosmic acceleration as the last stage of evolution. In both cases, inflation and late-time acceleration are connected by a tracker solution.

We study the possible positron/electron excesses within the multi-component leptonically decaying dark matter scenario by fitting the most recent AMS-02 data on the positron fraction and total e++e- flux. We show that both the two-component DM models are able to fit the two AMS-02 datasets.

We study neutrino models in which Majorana neutrino masses are generated radiatively through loop diagrams. We find that the neutrino mass spectrum is a normal hierarchy and the rate of the neutrinoless double beta decay can be large as it is dominated by the short-distance tree contribution. In addition, by using the neutrino oscillation data and comparing with the global fitting result in the literature, we obtain a unique neutrino mass matrix and predict the Dirac and two Majorana CP phases.